|
|
Effect of ladle bottom blowing on RH dehydrogenation and inclusions |
WEI Guang-sheng, DONG Jian-feng, ZHU Rong, HAN Bao-chen |
School of Metallurgy and Mcological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
|
|
Abstract The ladle bottom blowing in the RH(Ruhrstahl Heraeus) vacuum refining process has received extensive attention in recent years as a way to improve the refining effect. In order to study the influence of ladle bottom blowing on actual production. The effect of ladle bottom blowing on dehydrogenation and inclusions in the RH vacuum refining process was studied through industrial production experiments. The results show that increasing the bottom blowing of the ladle optimizes the flow and mixing of the molten steel inside the ladle, increases the collisional growth rate of inclusions and the average size of the inclusions, improves the dehydrogenation effect, and increases the dehydrogenation rate, especially the dehydrogenation rate at higher hydrogen mass percent. When the bottom blowing flow is 30 and 50 L/min , the vacuum time required to remove hydrogen to 0.000 2% is reduced by 5.58% and 16.40%, and the dehydrogenation rate is increased by 9.76% and 19.51% at this time. In addition, the increase in the number density of inclusions decreased from 64.2% to 49.7% and 13.0%, and the increase in the average area of inclusions increased from 17.34% to 40.98% and 53.37%.
|
Received: 08 August 2020
|
|
|
|
[1] LIU Bai-song, ZHU Guo-sen, LI Huan-xi, et al. Decarburization rate of RH refining for ultra low carbon steel[J]. International Journal of Minerals Metallurgy and Materials, 2010, 17(1): 22. [2] GUO Yin-tao, HE Sheng-ping, SHEN Bo-yi, et al. Morphology control for Al2O3 inclusion without Ca treatment in high-aluminum steel[J]. Metallurgical and Materials Transactions B Process Metallurgy and Materials Processing Science, 2015, 46(2): 585. [3] 潘晓倩,杨健,职建军,等. 超低碳汽车外板BH钢炼钢过程中夹杂物的演变[J]. 钢铁, 2019, 54(8): 48.( PAN Xiao-qian,YANG Jian,ZHI Jian-jun,et al. Evolution of inclusions in steelmaking process for ultra low carbon BH auto exposed panel[J]. Iron and Steel, 2019, 54(8): 48.) [4] Park Young-geu, Yi Kyung-woo, Ahn Sang-bog. The effect of operating parameters and dimensions of the RH system on melt circulation using numerical calculations[J]. ISIJ International, 2001, 41(5): 403. [5] Park Young-geu, Doo Won-chul, Yi Kyung-woo, et al. Numerical calculation of circulation flow rate in the degassing Rheinstahl-Heraeus process[J]. ISIJ International, 2000, 40(8): 749. [6] GENG Dian-qiao, LEI Hong, HE Ji-cheng. Numerical simulation of the multiphase flow in the Rheinsahl-Heraeus (RH) system[J]. Metallurgical and Materials Transactions B, 2010, 41(1):234. [7] 张利君,刘金刚,解家英,等. RH炉浸渍管非对称腐蚀的数值模拟和应用[J].中国冶金,2019,29(6),12.(ZHANG Li-jun, LIU Jin-gang, XIE Jia-ying, et al. Numerical simulation and application of asymmetrical corrosion of RH furnace snorkel[J]. China Metallurgy, 2019, 29(6): 12.) [8] 刘畅,任英,张立峰.网格大小对RH精炼大涡模拟正确性的影响[J].中国冶金,2018, 28(s1):8. (LIU Chang, REN Ying, ZHANG Li-feng. Effect of large eddy simulation on fluid flow of RH degassing process[J]. China Metallurgy, 2018, 28(s1):8.) [9] Da Silva C A, Da Silva I A, De Castro Martins E M, et al. Fluid flow and mixing characteristics in RH degasser of Companhia Siderúrgica de Tubarão, and influence of bottom gas injection and nozzle blockage through physical modelling study[J]. Ironmaking and Steelmaking, 2004, 31(1): 37. [10] Neves Leonardo, De Oliveira Hugo Passos Ornelas, Tavares Roberto Parreiras. Evaluation of the effects of gas injection in the vaccum chamber of a RH degasser on melt circulation and decarburization rates[J]. ISIJ International, 2009, 49(8):1141. [11] GENG Dian-qiao, LEI Hong, HE Ji-cheng. Simulation on flow field and mixing phenomenon in RH degasser with ladle bottom blowing[J]. Ironmaking and Steelmaking, 2012, 39(6): 431. [12] 靳宇,崔衡,张建伟. RH精炼底吹工艺优化的物理模拟[J].中国冶金,2019,29(4):17.(JIN Yu, CUI Heng, ZHANG Jian-wei. Physical simulation of RH refining bottom blowing process optimization[J]. China Metallurgy, 2019, 29(4):17.) [13] GENG Dian-qiao, ZHENG Jin-xing, WANG Kai, et al. Simulation on decarburization and inclusion removal process in the Ruhrstahl-Heraeus (RH) process with ladle bottom blowing[J]. Metallurgical and Materials Transactions B, 2015, 46(3): 1484. [14] CHEN Gu-jun, HE Sheng-ping. Mixing behavior in the RH degasser with bottom gas injection[J]. Vacuum, 2016,(130):48. [15] Zhu Bo-hong, Chattopadhyay Kinnor, Hu Xun-pu, et al. Optimization of sampling location in the ladle during RH vacuum refining process[J]. Vacuum, 2018, 152(1): 30. [16] LIU Wei, YANG Shu-feng, LI Jing-she, et al. Numerical investigation of inclusion motion at molten steel-liquid slag interface during Ruhrstahl Heraeus(RH) process[J]. The Journal of the Minerals, Metal and Materials Society,2018, 70: 2877. [17] 郭汉杰. 冶金物理化学教程[M]. 2版. 北京: 冶金工业出版社, 2006. (GUO Han-jie. Metallurgical Physical Chemistry Course[M]. 2nd Ed. Beijing: Metallurgical Industry Press,2006.) |
[1] |
ZHANG Yan-chao, ZHANG Cai-jun, ZENG Kai, XUE Rui, ZHU Li-guang, BAI Feng-qiang. Optimization and simulation of bottom blowing system for 300 t combined blown converter[J]. Iron and Steel, 2021, 56(5): 31-40. |
[2] |
WANG Bao1,LI Renchun2,LIU Junshan2,CHENG Rijin1,3,ZHANG Hua1,NI Hongwei1. Composition optimization of DC06 IF steel refining slag and control of oxygen in steel and slag[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2021, 33(4): 293-301. |
[3] |
SUI Ya-fei, DENG Zhi-xun, ZHAO Ru, QI Jiang-hua. Inclusions in hot rolled pickling plate for automobile structure through CSP process[J]. Iron and Steel, 2021, 56(4): 44-51. |
[4] |
FAN Cong-cong, MO Zhi-ying, LI Hai-xu, ZHAO Zheng-zhi, CUI Heng. Detection and characterization of inclusions in tinplate base steel slabs[J]. CONTINUOUS CASTING, 2021, 46(3): 24-27. |
[5] |
LI Yong-chao, LU Cai-ling, ZUO Jian-cheng, BAI Rui-juan, WANG Wei, HAN Huai-bin. Analysis and control of macro-inclusion of bearing steel in tundish first heat[J]. CONTINUOUS CASTING, 2021, 46(3): 35-39. |
[6] |
YAN Shun, LING Rui, TANG Zhenguang, OU Zengwei. Analysis and improvement of coldrolling strip breaking caused by internal defects of stainlesssteel raw materials[J]. PHYSICS EXAMINATION AND TESTING, 2021, 39(3): 38-. |
|
|
|
|